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Double pilot operated hydraulic check valve, ½” npt, 11 gpm
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![Basics of Check valves – Instrumentation and Control Engineering](https://i2.wp.com/automationforum-blog.s3.amazonaws.com/uploads/2018/03/ckvlvvv-795x385.png)
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![Installing a backflow prevention device](https://i2.wp.com/pw-cdn.watercorporation.com.au/-/media/WaterCorp/Image-Gallery/Page-Images/Developing-and-Building/TEMP-Developers-and-builders/double-check-valve.png?rev=8337863117004a8593983c5c39cf2b69&hash=8E6D2AC0A884E8FC806AD8F4A17FE9A6)
![Figure 18-9. Double check valve-exploded view.](https://i2.wp.com/constructioncranes.tpub.com/TM-5-3810-295-34/TM-5-3810-295-340346im.jpg)
![Double check valve relief assembly used throughout the purification](https://i2.wp.com/www.researchgate.net/profile/Oleg_Li/publication/321604301/figure/download/fig3/AS:613967730847745@1523392722219/Double-check-valve-relief-assembly-used-throughout-the-purification-system-A-check-valve.png)
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